<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>外部标签</title>
    <!--引入外部的链接-->
    <link rel="stylesheet" href="css/index.css">
</head>
<body>
    <div>我是MT</div>
    <p>我是段落</p>
</body>
</html>